Malicious Office (OOXML) / .XLSX — malware analysis report

Static analysis result for SHA-256 3c2affbc1ebfa4ba…

MALICIOUS

Office (OOXML) / .XLSX

714.4 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2024-06-19
MD5: 47d78ed0d85692cb36acd9718f399b6a SHA-1: db181e13566a7a28d7e0b9ef506b81d5782d8daf SHA-256: 3c2affbc1ebfa4baad8c6a66b844a8dd16287dce0f4efc1348f202698cc18a12
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The file is an Excel spreadsheet containing an embedded OLE object, identified as an Equation Editor. This object, located at xl/embeddings/vpK.7n, exhibits anomalies in its Ole10Native stream, suggesting it carries a malicious payload. The high entropy and size discrepancy within the Ole10Native stream indicate the object is designed to exploit vulnerabilities or deliver secondary malware when opened.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/vpK.7n contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • Equation Editor object carries payload-like Ole10Native stream high OLE_EQUATION_OLE10NATIVE_PAYLOAD_ANOMALY
    Embedded OLE object declares the Equation Editor CLSID but stores a large high-entropy Ole10Native stream with malformed package sizing. This is an exploit-shaped Equation/OLE payload container seen in malicious OOXML samples. It is not assigned to a specific CVE unless the MTEF/Equation Native primitive also matches.
  • Embedded OLE object medium OOXML_OLE_OBJECT
    Document contains an embedded OLE object

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
5a5c4390b7d2b7050a663d1d7ba2e11841a05336d563348e46dcf7241d93e732		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/vpK.7n 975360 bytes
ooxml_oleobject_00_ole10native_00.bin
003a61d6f799e3c3d1da3a9d045a769392713a9814c239145f01ac976703b1b6		 ole-package OOXML xl/embeddings/vpK.7n Ole10Native stream: OLE10naTive 965244 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.